$$\cos\ 3\ n+\cos\ 2m=0$$
$n=-\frac{\cos(2m)}{\cos(3)}$
$$\cos(3)n=-\cos(2m)$$
$$\frac{\cos(3)n}{\cos(3)}=-\frac{\cos(2m)}{\cos(3)}$$
$$n=-\frac{\cos(2m)}{\cos(3)}$$
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